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Commonly, jumbo frames refer to Ethernet frames that carry a payload of more than 1500 bytes and up to 9000 bytes. To ensure the frame size stays the same size through the infrastructure, the frame size must be set end-to-end (database server, Ethernet switches, and PowerStore) in the infrastructure. If the frame size is not consistently defined end-to-end, the maximum frame size used will be the smallest value defined in the infrastructure.
Oracle recommends using Jumbo frames when dNFS is used. Jumbo frames allow the network stack to bundle payloads into larger frames and reduce TCP overhead. The frame size of any frame can vary depending on the immediate needs of the network session established between the NFS client and NFS server.
The maximum frame size is defined by setting the maximum transmission unit (MTU). By default, PowerStore NAS File interfaces and PowerStore Ethernet interfaces are set to MTU 1500, but can support a maximum of 9000.
MTU 9000 might be acceptable for heavy dNFS work loads, but it should be evaluated in a nonproduction environment before changing it in production.
Note: The maximum MTU size of a NAS file interface depends on the PowerStore Cluster MTU size. To increase the NAS file interface MTU, the PowerStore Cluster MTU must already be equal to or greater than the target NAS file interface MTU value. The maximum MTU value for the PowerStore Cluster is 9000.
For more information, see the following documents: